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Cathedral on return of holy relic I exported especially (7)

Ross

I believe the answer is:

largely

I'm a little stuck... Click here to teach me more about this clue!

'especially' is the definition.
Both the definition and answer are adverbs. Perhaps there's a link between them I don't understand?

'cathedral on return of holy relic i exported' is the wordplay.
I cannot really understand how this works, but
'cathedral' could be 'ely' (cathedral city in Cambridgeshire) and 'ely' is present in the answer.
'i' could be 'a' and 'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for largely that I've seen before include "Mainly" , "On the whole" , "as a rule" , "To a great extent" , "to a considerable extent" .)

I've seen this clue in The Telegraph.
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