Drug makes writing bolder one supposes (8)

I believe the answer is:

methinks

'one supposes' is the definition.

'drug makes writing bolder' is the wordplay.
'drug' becomes 'meth' (meth is a kind of drug).
'makes writing bolder' becomes 'inks'.
'meth'+'inks'='METHINKS'

(Other definitions for methinks that I've seen before include "I reckon" , "I gather" , "In my view - knit hems (anag)" , "I believe" , "I feel ..." .)

I've seen this clue in The Independent.

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