Crossword Genius

Take heart young man. Out of bed! (4,2)

Ross

I believe the answer is:

buck up

'take heart' is the definition.
(synonyms)

'young man out of bed' is the wordplay.
'young man' becomes 'buck' (old-fashioned term for a young man).
'out of bed' becomes 'up' (synonyms).
'buck'+'up'='BUCK UP'

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

I've seen this clue in the Sydney Morning Herald.
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