Learner driver needing two wheels for convenience? (3)
I believe the answer is:
loo
'convenience?' is the definition.
(both can mean a toilet)
'learner driver needing two wheels' is the wordplay.
'learner driver' becomes 'l' (learner drivers have L-plates on their cars).
'needing' says to put letters next to each other.
'two wheels' becomes 'OO' (O looks like a wheel).
'l'+'oo'='LOO'
'for' is the link.
(Other definitions for loo that I've seen before include "Little boys' room" , "A colloquial toilet" , "Toilet (informal)" , "Card-game" , "In which one goes" .)