Consider losing kilos to get slim (4)
I believe the answer is:
thin
'slim' is the definition.
(I know that slim can be written as thin)
'consider losing kilos' is the wordplay.
'consider' becomes 'think' (I've seen this before).
'losing' is a deletion indicator.
'kilos' becomes 'k' (abbreviation).
'think' with 'k' taken out is 'THIN'.
'to get' is the link.
(Other definitions for thin that I've seen before include "Fine" , "Narrow, slim" , "Lean; narrow" , "Scrawny" , "Slim - watery" .)