Apt to take for one’s own use (11)
I believe the answer is:
appropriate
'apt' is the definition.
(synonyms)
'for one's own use' is the wordplay.
I cannot really see how this works, but
'for' could be 'pro' (as in being 'pro' something) and 'pro' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
This explanation may well be incorrect...
'to take' acts as a link.
Can you help me to learn more?
(Other definitions for appropriate that I've seen before include "Steal - suitable" , "Trouser" , "Fit" , "Whip" , "nick" .)