Disinclined to engineer rental cut (9)
I believe the answer is:
reluctant
'disinclined' is the definition.
('reluctant' can be similar in meaning to 'disinclined')
'engineer rental cut' is the wordplay.
'engineer' indicates an anagram.
'rental'+'cut'='rentalcut'
'rentalcut' anagrammed gives 'RELUCTANT'.
'to' acts as a link.
(Other definitions for reluctant that I've seen before include "Disinclined to become involved" , "Not wishing to" , "Unwilling to do something" , "Slow" , "Indisposed" .)