Dog I'm unsure about since barking in pound etc (10)

I believe the answer is:

currencies

'pound etc' is the definition.
(pound sterling is a currency)

'dog i'm unsure about since barking' is the wordplay.
'dog' becomes 'cur' (both can mean a despicable person).
'i'm unsure' becomes 'er' (expression of hesitation).
'about' is a reversal indicator.
'barking' indicates anagramming the letters (UK slang for mad).
'er' in reverse letter order is 're'.
'since' is an anagram of 'ncies'.
'cur'+'re'+'ncies'='CURRENCIES'

'in' acts as a link.

I've seen this clue in The Guardian.

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