A little liquid, methinks not writing fluid (5)

I believe the answer is:

meths

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'a little liquid methinks not writing fluid' is the definition.
I can't judge whether this defines the answer.

'methinks not writing fluid' is the wordplay.
'not' suggests deleting specific letters.
'writing fluid' becomes 'ink' (fluid used for writing).
'methinks' with 'ink' taken out is 'METHS'.

Can you help me to learn more?

(Other definitions for meths that I've seen before include "Spirit" , "Fuel" , "Methylated spirits (colloq.)" , "Violet-coloured alcohol" , "unsuitable alcohol" .)

I've seen this clue in the Evening Standard.

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