Crossword Genius

Ride this ultimately — and go off heroin? (6,5)

Ross

I believe the answer is:

saddle horse

'ride' is the definition.

'this ultimately and go off heroin?' is the wordplay.
'ultimately' indicates one should take the final letters.
'and' is a charade indicator (letters next to each other).
'go off' becomes 'addle' (eg an egg might addle).
'heroin?' becomes 'horse' ('horse' can be a synonym of 'heroin').
The last letter of 'this' is 's'.
's'+'addle'+'horse'='SADDLE-HORSE'

(Other definitions for saddle horse that I've seen before include "Mount" , "Wooden frame used to clean and store riding tackle" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app