Last team member, perhaps (8)
I believe the answer is:
eleventh
'last' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I can't see?
'team member perhaps' is the wordplay.
'team' becomes 'eleven' (eleven is a kind of team).
'member perhaps' becomes 'th' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'eleven'+'th'='ELEVENTH'
Can you help me to learn more?
(Other definitions for eleventh that I've seen before include "This hour offers the last chance" , "at such a late hour?" , "it's after ten" , "This hour is the latest possible time for doing something" , "Heel vent (anag)" .)