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According to what is heard, lazy pupils practise hero worship (7)

Ross

I believe the answer is:

idolise

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

'worship' is the definition.
(I know that worship can be written as idolise)

'according to what is heard lazy pupils practise hero' is the wordplay.
I cannot really understand how this works, but
'is' is within the answer.
'practise' could be 'do' (synonyms) and 'do' is located in the answer.
The remaining letters 'ile' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for idolise that I've seen before include "Make into a figure of worship" , "Revere, love greatly" , "Doilies to worship" , "Pay excessive attention to" , "Love too much" .)

I've seen this clue in The Irish Independent.
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