Meet old boy being entertained by dad (10)

I believe the answer is:

foregather

'meet' is the definition.
('foregather' can be a synonym of 'meet')

'old boy being entertained by dad' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'boy' becomes 'reg'.
'being entertained by' indicates putting letters inside (I've seen this in other clues).
'dad' becomes 'father' (I've seen this before).
'o'+'reg'='oreg'
'oreg' going within 'father' is 'FOREGATHER'.

I've seen this clue in The Telegraph.

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