True love can prove so extravagant (5)

I believe the answer is:

outre

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'extravagant' is the definition.
(outre can mean extravagant or eccentric)

'true love can' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'can' indicates anagramming the letters (I've seen 'canned' mean this (canned can mean drunk)).
'true'+'o'='trueo'
'trueo' is an anagram of 'OUTRE'.

'prove so' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for outre that I've seen before include "kinky?" , "Deviating from normal" , "Odd, bizarre" , "Not abiding by what is proper" , "Off the wall" .)

I've seen this clue in The Globe and Mail.

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