Crossword Genius

Trotsky buys pint with old money (6)

Ross

I believe the answer is:

lepton

'old money' is the definition.
(old Greek coin)

'trotsky buys pint' is the wordplay.
'trotsky' becomes 'Leon' (Russian revolutionary Leon Trotsky).
'buys' is an insertion indicator (inserted letters are 'bought' or acquired).
'pint' becomes 'pt' (abbreviation).
'leon' placed around 'pt' is 'LEPTON'.

'with' is the link.

(Another definition for lepton that I've seen is " Subatomic particle".)

I've seen this clue in The Guardian.
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