Was inclined to have a bit of fun when let out (5)
I believe the answer is:
leant
'was inclined' is the definition.
(I've seen this before)
'have a bit of fun when let out' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found in the answer.
'have' could be 'let' (synonyms) and 'let' is found within the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for leant that I've seen before include "Advanced" , "bent over" , "Tilted" , "Inclined (towards)" , "Slanted" .)