Inclined to use spare time (5)
I believe the answer is:
leant
'inclined' is the definition.
(I've seen this in another clue)
'spare time' is the wordplay.
'spare' becomes 'lean' (similar in meaning).
'time' becomes 't' (abbreviation).
'lean'+'t'='LEANT'
'to use' acts as a link.
(Other definitions for leant that I've seen before include "Relied (on); inclined" , "Slanted" , "Tipped" , "Advanced" , "pressed on" .)