Crossword Genius

Needing drink, son pops out to get three by ten? (6)

Ross

I believe the answer is:

thirty

'three by ten?' is the definition.
(30 is 3 x 10)

'needing drink son pops out' is the wordplay.
'needing drink' becomes 'thirsty' (someone thirsty is in need of a drink).
'son' becomes 's' (genealogical abbreviation for son).
'pops out' suggests deleting specific letters.
'thirsty' with 's' taken out is 'THIRTY'.

'to get' acts as a link.

(Other definitions for thirty that I've seen before include "Sum of first four perfect squares" , "Roman number XXX" , "November's days" , "Number of pieces of silver paid to Judas" , "Both RU teams" .)

I've seen this clue in The Times.
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