A number of coaches to give instruction (5)

I believe the answer is:

train

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'a number of coaches' is the definition.
'train' can be an answer for 'coaches' (I've seen this before). I am not sure about the 'a number of' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for train that I've seen before include "Instruct - exercise" , "Try to get fit" , "Number of eg carriages in a line" , "Learn a skill etc. through practice" , "Teach, retinue" .)

I've seen this clue in The Irish Independent.

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