Wild worker on slope (7)
I believe the answer is:
rampant
'wild' is the definition.
(I've seen this before)
'worker on slope' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'on' is a charade indicator (letters next to each other).
'slope' becomes 'ramp' (I've seen this in another clue).
'ant' put after 'ramp' is 'RAMPANT'.
(Other definitions for rampant that I've seen before include "Fulminate" , "Unbridled" , "Showing unrestrained growth" , "On the rampage" , "Unrestrained and violent" .)