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Last drop of emulsion in paint tin possibly having no consistency (13)

Ross

I believe the answer is:

temperamental

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'having no consistency' is the definition.
I can't judge whether this defines the answer.

'last drop of emulsion in paint tin possibly' is the wordplay.
'last drop of' says to take the final letters.
'in' means one lot of letters goes inside another.
'paint' becomes 'tempera' (type of paint).
'tin possibly' becomes 'metal' (tin is a kind of metal).
The final letter of 'emulsion' is 'n'.
'tempera'+'metal'='temperametal'
'n' inserted within 'temperametal' is 'TEMPERAMENTAL'.

Can you help me to learn more?

(Other definitions for temperamental that I've seen before include "Unreliable" , "Likely to act unpredictably" , "Given to mood changes" , "Having a volatile disposition" , "Difficult" .)

I've seen this clue in The Telegraph.
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