One of a pack for Jack to back (5)

I believe the answer is:

tarot

I'm a little stuck... Click here to teach me more about this clue!

'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.

'jack to back' is the wordplay.
'jack' becomes 'tar' (both are informal terms for sailor).
'back' is a reversal indicator.
'to' reversed gives 'ot'.
'tar'+'ot'='TAROT'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for tarot that I've seen before include "Arcana cards" , "Method of fortune-telling" , "Card used for fortunetelling" , "Fortune teller's seventy eight card pack" , "Fortune-teller's card" .)

I've seen this clue in the Evening Standard.

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