Crossword Genius

Train? There’s one in a minute (3)

Ross

I believe the answer is:

aim

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

'one in a minute' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'minute' becomes 'm' (abbreviation).
'a'+'m'='am'
'i' put inside 'am' is 'AIM'.

'there's' is the link.

(Other definitions for aim that I've seen before include "Set sights on, say target" , "Object; intend" , "intent" , "Steady, ... fire" , "Set sights on, target or goal" .)

I've seen this clue in The Times.
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