One of a pack taking a trot (5)

I believe the answer is:

tarot

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'one of a pack' is the definition.
'tarot' can be an answer for 'pack' (type of card pack). I'm not sure about the 'one of a' bit.

'taking a trot' is the wordplay.
'taking' is an insertion indicator.
'a' put within 'trot' is 'TAROT'.

Can you help me to learn more?

(Other definitions for tarot that I've seen before include "Fortune-teller's card" , "Mystic cards" , "Card used for fortunetelling" , "78-card pack" , "fortune-teller?" .)

I've seen this clue in the Evening Standard.

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