Pal senses she’s suffering lack of form (13)

I believe the answer is:

shapelessness

'lack of form' is the definition.
(I've seen this before)

'pal senses she's suffering' is the wordplay.
'suffering' is an anagram indicator.
'pal'+'senses'+'shes'='palsensesshes'
'palsensesshes' is an anagram of 'SHAPELESSNESS'.

(Another definition for shapelessness that I've seen is " Lack of form".)

I've seen this clue in The Sunday Times and The Times.

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