Regularly turned puce when it was all too much (5)

I believe the answer is:

undue

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'too much' is the definition.
(I've seen this before)

'regularly turned puce' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'turned'+'puce'='turnedpuce'
The alternate letters of 'turnedpuce' are 'UNDUE'.

'when it was all' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for undue that I've seen before include "Excessive amount" , "Beyond normal limits" , "Lacking justification" , "Excessive, unreasonable" , "Needless; excessive" .)

I've seen this clue in the Sydney Morning Herald.

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