Be good at getting alms (3)

I believe the answer is:

beg

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'at getting alms' is the definition.
I can't tell whether this definition defines the answer.

'be good' is the wordplay.
'good' becomes 'g' (abbreviation).
'be'+'g'='BEG'

Can you help me to learn more?

(Other definitions for beg that I've seen before include "Plead or importune" , "Earnestly entreat" , "Plead or ask for alms" , "Plead as for help" , "Ask humbly" .)

I've seen this clue in the Evening Standard.

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