Coach is fully prepared and is on track for what any boy could accept for the present (5,3)
I believe the answer is:
train set
'is on track for what any boy could accept for the present' is the definition.
I know nothing about this answer so I can't tell whether this works.
'coach is fully prepared' is the wordplay.
'coach' becomes 'train' ('train' can be a synonym of 'coach').
'is fully prepared' becomes 'set' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'train'+'set'='TRAIN SET'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for train set that I've seen before include "Toy for dads?" , "Toy with rail track" , "model railway" , "little loco with this?" , "Nitrates (anag) - Hornby product?" .)