Strength drug swallowed by Mr Muscle (8)

I believe the answer is:

masseter

'muscle' is the definition.
(I've seen this before)

'strength drug swallowed by mr' is the wordplay.
'strength' becomes 'asset' (asset can mean a strength or valuable quality).
'drug' becomes 'e' (E is another name for ecstasy).
'swallowed by' is an insertion indicator.
'asset'+'e'='assete'
'assete' going into 'mr' is 'MASSETER'.

(Another definition for masseter that I've seen is " Muscle".)

I've seen this clue in The Times.

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