Has he a jolly grin? (5)

I believe the answer is:

roger

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'has' is the definition.
Although both the answer and definition are verbs, they are not in the same form of the verb.

'he a jolly grin?' is the wordplay.
'he' becomes 'Rog'.
'a jolly grin?' becomes 'er' (I am not sure about this - if you are sure you should believe this answer much more).
'rog'+'er'='ROGER'

Can you help me to learn more?

(Other definitions for roger that I've seen before include "Received (in radio comms)" , "I hear you" , "Jolly man" , "Romeo's predecessor" , "I've got the message" .)

I've seen this clue in the Evening Standard.

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