Inclined to be fast it's said (5)
I believe the answer is:
leant
'inclined' is the definition.
(I've seen this in another clue)
'be fast it's said' is the wordplay.
'be fast' becomes 'lean' (leaning is a kind of being. I am not sure about the 'fast' bit.).
'it's said' becomes 't' (I've seen this in other clues).
'lean'+'t'='LEANT'
'to' is the link.
Can you help me to learn more?
(Other definitions for leant that I've seen before include "Relied (on); inclined" , "Advanced" , "pressed on" , "Had tendency" , "Tipped" .)