Once is not enough for him to start rolling in the hay (5)

I believe the answer is:

harry

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'once is not enough' is the definition.
I can't tell whether this definition defines the answer.

'for him to start rolling in the hay' is the wordplay.
'for him' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'to start' suggests taking the first letters.
'in the' is an insertion indicator.
The first letter of 'rolling' is 'r'.
'r'+'r'='rr'
'rr' put inside 'hay' is 'HARRY'.

Can you help me to learn more?

(Other definitions for harry that I've seen before include "Harass; man's name" , "Hound" , "Persistently attack (an enemy)" , "Ravage - prince" , "Make repeated attacks on, badger" .)

I've seen this clue in the Evening Standard.

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