Small baby loses pound accidentally - appalling! (7)

I believe the answer is:

abysmal

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'accidentally appalling' is the definition.
'abysmal' can be an answer for 'appalling' (abysmal can mean terrible). I'm not certain of the 'accidentally' bit.

'small baby loses pound' is the wordplay.
'small' becomes 'baby'.
'baby' becomes 'small'.
'loses' is a deletion indicator.
'pound' becomes 'lb' (abbreviation for the unit of weight).
'baby'+'small'='babysmall'
'babysmall' with 'lb' removed is 'ABYSMAL'.

Can you help me to learn more?

(Other definitions for abysmal that I've seen before include "Very deep or bad" , "Dreadful" , "Very bad indeed" , "Deplorable, extremely bad - say ignorance" , "Shockingly bad" .)

I've seen this clue in The Irish Times.

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