Free time absorbed by construction toy (3,2)
I believe the answer is:
let go
'free' is the definition.
(I've seen this before)
'time absorbed by construction toy' is the wordplay.
'time' becomes 't' (abbreviation).
'absorbed by' is an insertion indicator.
'construction toy' becomes 'lego' (I've seen this in another clue).
't' going inside 'lego' is 'LET GO'.
(Other definitions for let go that I've seen before include "Set at liberty, loose grip on" , "Loose one's grip" , "Relinquish one's grip" , "Dismiss (from ones thoughts?)" , "Release or permit to depart" .)