Fellow becomes tense in the middle, actually it’s complete (6)
I believe the answer is:
intact
'complete' is the definition.
(I've seen this before)
'fellow becomes tense in the middle actually' is the wordplay.
I cannot really see how this works, but
'tense' could be 't' (abbreviation used in many dictionaries) and 't' is located in the answer.
'in' is found in the answer.
The remaining letters 'act' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for intact that I've seen before include "without flaw?" , "Inviolate" , "Whole - unbroken" , "Complete - undamaged" , "Unbroken and unimpaired" .)