Ignorant hunk, now in gardening trousers (9)
I believe the answer is:
unknowing
'ignorant' is the definition.
(I've seen this before)
'hunk now in gardening trousers' is the wordplay.
'trousers' says the answer is hidden in the clue (to trouser can mean to contain or hold).
'UNKNOWING' can be found hidden inside 'hunk now in gardening'.
(Other definitions for unknowing that I've seen before include "Not aware" , "Ignorant" , "Lacking awareness" , "Ignorance" .)