In the morning, giant regularly twisted head of insect? (5)

I believe the answer is:

tagma

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'head of insect?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'in the morning giant regularly twisted' is the wordplay.
'in the morning' becomes 'am' (AM on a clock).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'twisted' shows that the letters should be reversed in order.
The alternate letters of 'giant' are 'gat'.
'am'+'gat'='amgat'
'amgat' backwards is 'TAGMA'.

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I've seen this clue in The Independent.

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