Is shocking piece of software inadequate too? (6)

I believe the answer is:

appals

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'is shocking piece' is the definition.
I can't tell whether this defines the answer.

'software inadequate too?' is the wordplay.
'software' becomes 'app' (software application).
'inadequate' means to remove the last letter (an incomplete or inadequate form of the word).
'too?' becomes 'also' (synonyms).
'also' with its final letter removed is 'als'.
'app'+'als'='APPALS'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for appals that I've seen before include "Fills with dismay or horror (6)" , "Fills with disgust" , "Shocks" , "'Horrifies, outrages (6)'" .)

I've seen this clue in The Times.

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