Sign outside worker’s outhouse? (4-2)
I believe the answer is:
lean-to
'outhouse?' is the definition.
(thesaurus)
'sign outside worker's' is the wordplay.
'sign' becomes 'leo' (star sign).
'outside' means one lot of letters goes inside another (some letters go outside others).
'worker' becomes 'ant' (worker is a type of ant).
'leo' going around 'ant' is 'LEAN-TO'.
(Other definitions for lean-to that I've seen before include "Rough shelter with one-sloped roof" , "On late (anag)" , "Small building resting on side of larger one" , "It's roof slants against a wall" , "greenhouse, perhaps" .)