Crossword Genius

Hasten to make the price a dollar higher (4,2)

Ross

I believe the answer is:

buck up

I'm a little stuck... Click here to teach me more about this clue!

'hasten to make the price a' is the definition.
I can't tell whether this defines the answer.

'dollar higher' is the wordplay.
'dollar' becomes 'buck' (slang).
'higher' becomes 'up'.
'buck'+'up'='BUCK UP'

Can you help me to learn more?

(Other definitions for buck up that I've seen before include "Hurry or become more cheerful - like wild horse?" , "Informally become more cheerful or make haste - like restless horse?" , "Take heart" , "Become more cheerful like unruly horse" , "Become more serious" .)

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