Father yards behind Penny on foot ahead (6)
I believe the answer is:
prepay
'father yards behind penny on foot ahead' is the definition.
I can't judge whether this definition defines the answer.
'penny on foot ahead' is the wordplay.
'penny' becomes 'p' (short for pence).
'on' becomes 're' ('on' can be mean 'with reference to').
'foot' becomes 'pay' (as in footing the bill).
'ahead' says to put letters next to each other.
'p'+'re'+'pay'='PREPAY'
Can you help me to learn more?
(Other definitions for prepay that I've seen before include "Remit for something before receiving it" , "Give money (for goods) in advance" , "Offer retainer" , "settle early" , "Fork out in advance of delivery" .)