It can be faced with a tricky sum, I see (5)

I believe the answer is:

music

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'it can be faced' is the definition.
The definition suggests a singular noun which matches the answer.

'tricky sum i see' is the wordplay.
'tricky' indicates an anagram.
'see' becomes 'C' (the word for the letter, according to Chambers).
'sum' is an anagram of 'mus'.
'mus'+'i'+'c'='MUSIC'

'with a' acts as a link.

Can you help me to learn more?

(Other definitions for music that I've seen before include "'Fled is that ---: do I wake or sleep?' (Keats)" , "being confined by bars?" , "Vocal or instrumental sound" , "Harmonious sound (generally!)" , "Vocal or instrumental sounds" .)

I've seen this clue in the Evening Standard.

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