Interested spectator ripped rev's robe (8)

I believe the answer is:

observer

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

'interested spectator' is the definition.
'observer' can be an answer for 'spectator' (I've seen this before). I'm unsure of the 'interested' bit.

'ripped rev's robe' is the wordplay.
'ripped' is an anagram indicator (letters ripped or torn up).
'revs'+'robe'='revsrobe'
'revsrobe' anagrammed gives 'OBSERVER'.

Can you help me to learn more?

(Other definitions for observer that I've seen before include "One watching attentively" , "monitor" , "I notice" , "One who watches" , "organ on Sunday" .)

I've seen this clue in The Sun and The Times.

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