Foolishly altering any line that's not straight (7)

I believe the answer is:

inanely

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'foolishly' is the definition.
(synonyms)

'any line that's not straight' is the wordplay.
'that's not straight' is an anagram indicator.
'any'+'line'='anyline'
'anyline' anagrammed gives 'INANELY'.

'altering' is the link.
I am not very happy about this link. It may belong to another bit of the clue.

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(Other definitions for inanely that I've seen before include "in a daft way" , "Stupidly" , "In a fatuous manner" , "Senselessly" , "Vapidly" .)

I've seen this clue in The Irish Independent and The Globe and Mail.

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