Left amongst friends becomes less interesting (5)

I believe the answer is:

palls

'becomes less interesting' is the definition.
(I've seen this before)

'left amongst friends' is the wordplay.
'left' becomes 'l' (common abbreviation).
'amongst' indicates putting letters inside (I've seen this in other clues).
'friends' becomes 'pals' (pal is a kind of friend).
'l' going inside 'pals' is 'PALLS'.

(Another definition for palls that I've seen is " Becomes less interesting".)

I've seen this clue in The Telegraph.

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