School trips which caretakers are asked to go on (7,8)

'school trips which caretakers are asked' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'go on' is the wordplay.
I cannot quite see how this works, but
'on' could be 're' (regarding) and 're' is found in the answer.
'go' could be 'pan' (panning is a kind of going) and 'pan' is found in the leftover letters.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?