Instruct class producing toy (5,3)
I believe the answer is:
train set
'toy' is the definition.
(train set is a type of toy)
'instruct class' is the wordplay.
'instruct' becomes 'train' (training is a kind of instructing).
'class' becomes 'set' (I've seen this in other clues).
'train'+'set'='TRAIN-SET'
'producing' is the link.
(Other definitions for train set that I've seen before include "Number of tracked items" , "Model tracking" , "Nitrates (anag) - Hornby product?" , "little loco with this?" , "Toy for dads?" .)