Meet up maybe to welcome back war invalid? (7)
I believe the answer is:
amputee
'war invalid?' is the definition.
(war might make someone an amputee)
'meet up maybe to welcome back' is the wordplay.
'to welcome' indicates the answer is hidden within the clue (I've seen 'welcoming' mean this).
'back' says the letters should be written backwards.
'eetupma' is hidden within 'meet up maybe'.
'eetupma' back-to-front is 'AMPUTEE'.
(Other definitions for amputee that I've seen before include "Person with limb(s) removed" , "Person who has had limb removed surgically" , "Person with a limb severed" , "One who has limb surgically removed" , "One with missing limb" .)