Crossword Genius

Pair on alert, frolicking in common (11)

Ross

I believe the answer is:

proletarian

'common' is the definition.
(thesaurus)

'pair on alert frolicking' is the wordplay.
'frolicking' is an anagram indicator.
'pair'+'on'+'alert'='paironalert'
'paironalert' with letters rearranged gives 'PROLETARIAN'.

'in' is the link.

(Other definitions for proletarian that I've seen before include "Relating to the workers" , "Ordinary worker (Marxism)" , "Working-class" , "Characteristic of the working class" .)

I've seen this clue in The Telegraph.
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