Allowed to keep article over in outhouse (4-2)
I believe the answer is:
lean-to
'outhouse' is the definition.
(thesaurus)
'allowed to keep article over' is the wordplay.
'allowed to' becomes 'let' (to let something happen is to allow it).
'keep' means one lot of letters goes inside another.
'article' becomes 'an' (indefinite article).
'over' becomes 'o' (cricket abbreviation).
'let' going around 'an' is 'leant'.
'leant'+'o'='LEAN-TO'
'in' acts as a link.
(Other definitions for lean-to that I've seen before include "Building with roof resting against larger building (4, 2)" , "greenhouse, perhaps" , "On late (anag)" , "Outhouse" , "Penthouse" .)