Pack Tesla with Ribena in the back? Bosh! (5)
I believe the answer is:
tarot
'pack' is the definition.
(type of card pack)
'tesla with ribena in the back? bosh' is the wordplay.
I cannot really understand how this works, but
'tesla' could be 't' (scientific unit) and 't' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'aro' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tarot that I've seen before include "fortune-teller?" , "Cards often used in fortune-telling" , "Arcana cards" , "78-card pack" , "Pack member" .)