Sorry about dog maybe biting indefinite number attending function (9)

I believe the answer is:

repentant

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'sorry' is the definition.
(similar in meaning)

'biting indefinite number attending function' is the wordplay.
'biting' means one lot of letters goes inside another (bite can mean to puncture or penetrate).
'indefinite number attending' becomes 'repent' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'function' becomes 'tan' (tangent, mathematical function).
'repent' placed around 'tan' is 'REPENTANT'.

'about dog maybe' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for repentant that I've seen before include "Contrite" , "Feeling remorse for misdeeds" , "Regretful" , "sorry state" , "showing contrition" .)

I've seen this clue in The Telegraph.

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