Crossword Genius

It peps up one tucking into fresh greens with hesitation (9)

Ross

I believe the answer is:

energiser

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'it peps up' is the definition.
The definition suggests a singular noun which matches the answer.

'one tucking into fresh greens with hesitation' is the wordplay.
'one' becomes 'i' (Roman numeral).
'tucking into' is an insertion indicator.
'fresh' is an anagram indicator (a fresh re-ordering of the letters).
'with' says to put letters next to each other.
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'greens' with letters rearranged gives 'energs'.
'i' inserted inside 'energs' is 'energis'.
'energis'+'er'='ENERGISER'

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