Irascible taxi-driver keeping right (6)
I believe the answer is:
crabby
'irascible' is the definition.
(I've seen this in another clue)
'taxi-driver keeping right' is the wordplay.
'taxi-driver' becomes 'cabby' (I've seen this before).
'keeping' means one lot of letters goes inside another (some letters kept inside).
'right' becomes 'r' (common abbreviation).
'cabby' enclosing 'r' is 'CRABBY'.
(Other definitions for crabby that I've seen before include "like one playing with sea? Just so" , "Cantankerous like crustacean" , "Temperamental" , "petulant" , "Irritable - like a crustacean?" .)