Almost captured as well (3)
I believe the answer is:
too
'as well' is the definition.
(both can mean 'also')
'almost captured' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'captured' becomes 'took' (take can mean to capture or get control of).
'took' with its last letter removed is 'TOO'.
(Other definitions for too that I've seen before include "What a pity!" , "Also; overly" , "To a greater than desirable extent" , "Excessively" , "As well, also" .)