Convoy MKF 22 arrived in the Clyde on the 9/Sept/1943. Normally troops would be disembarked the next day.
No other troop convoys with the exception of two single vessel troop convoys the US flagged GENERAL JOHN POPE on the 12th from Hampton Roads and the French vessel CHAMPOLLIAN from Iceland on the 7th, arrived in the Clyde area between the 5th and the 15th of September 1943.
My guess is your man was part of MKF 22.
Problem is there were 3 troopships that sailed from Gibraltar and others that sailed from
nearby ports.
The Gibraltar contingent comprised CAMERONIA, DEMPO (Dutch) and DOMINION MONARCH.
Researching troopships is always difficult because of the obvious security considerations. Army War diaries rarely give names of vessels but as a rule referred to them in code. This code changed from one convoy to the next.
Take a look here
http://www.convoyweb.org.uk/mkf/index.html?mkf.php?convoy=22!~mkfmainYou will note both CAMERONIA and DOMINION MONARCH had some problems. I know DOMINIAN MONARCH underwent repairs at Liverpool until 16/October/1943 but have no record of CAMERONIA.
I think your best bet is to look at the convoy reports at Kew to try and find out which vessel, if any was attacked and returned to Gibraltar.
http://discovery.nationalarchives.gov.uk/SearchUI/s/res?_aq=&_ep=mkf+22&_or1=&_or2=&_or3=&_nq1=&_nq2=&_nq3=&_sd=&_ed=&_col=0&_sw=ref&_cr1=adm&_cr2=&_cr3=&_ps=15&_ro=any&_rd=&_rsd=&_red=&_fr=&_st=advDo you have the name of your mans regiment or unit?