Inclined to get slim before beginning to tan (5)
I believe the answer is:
leant
'inclined' is the definition.
(I've seen this before)
'slim before beginning to tan' is the wordplay.
'slim' becomes 'lean' ('lean' can be similar in meaning to 'slim').
'before' is a charade indicator (letters next to each other).
'beginning to' says to take the initial letters.
The initial letter of 'tan' is 't'.
'lean'+'t'='LEANT'
'to get' is the link.
(Other definitions for leant that I've seen before include "Inclined (towards)" , "bent over" , "Advanced" , "Tilted" , "pressed on" .)