Commonly seen in Lala, Surinder and Mohinder (4,2,3,6)

'commonly' is the definition.
Both the definition and answer are adverbs.
Perhaps you can see an association between them that I can't see?

'in lala surinder and mohinder' is the wordplay.
I cannot really understand how this works, but
'in' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
This explanation may well be incorrect...

'seen' is the link.