Crossword Genius

Loco observer teaches craftsman (5,7)

Ross

I believe the answer is:

train spotter

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'loco observer' is the definition.
The definition suggests a singular noun which matches the answer.

'teaches craftsman' is the wordplay.
'teaches' becomes 'trains' (training is a kind of teaching).
'craftsman' becomes 'potter' (potter is a kind of craftsman).
'trains'+'potter'='TRAIN-SPOTTER'

Can you help me to learn more?

(Other definitions for train spotter that I've seen before include "Railway enthusiast" , "Anorak" , "Loco number collector" , "Transport buff" , "Anorak-clad hobbyist" .)

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