Learner driver on two wheels for convenience? (3)
I believe the answer is:
loo
'convenience?' is the definition.
(both can mean a toilet)
'learner driver on two wheels' is the wordplay.
'learner driver' becomes 'l' (learner drivers have L-plates on their cars).
'on' means one lot of letters go next to another.
'two wheels' becomes 'OO' (O looks like a wheel).
'l'+'oo'='LOO'
'for' acts as a link.
(Other definitions for loo that I've seen before include "Toilet (informal)" , "The little room - card game" , "Card-game" , "Card game; the 'smallest room'" , "A colloquial toilet" .)