It is thus legal to pester by begging (7)

I believe the answer is:

solicit

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'pester by begging' is the definition.
I can't judge whether this defines the answer.

'it is thus legal' is the wordplay.
'it is thus' becomes 'so' (synonyms).
'legal' becomes 'licit' (similar in meaning).
'so'+'licit'='SOLICIT'

'to' is the link.

Can you help me to learn more?

(Other definitions for solicit that I've seen before include "Accost - request" , "Request, induce" , "Ask earnestly about colitis" , "Try to obtain (something) from someone" , "Ask earnestly,seek to obtain" .)

I've seen this clue in The Irish Independent.

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