Product is built, centred and wholly durable (14)

I believe the answer is:

indestructible

I'm a little stuck... Click here to teach me more about this clue!

'wholly durable' is the definition.
'indestructible' can be an answer for 'durable' (synonyms). I am unsure of the 'wholly' bit.

'product is built centred' is the wordplay.
'product' indicates an anagram (I've seen 'product of' mean this).
'is'+'built'+'centred'='isbuiltcentred'
'isbuiltcentred' anagrammed gives 'INDESTRUCTIBLE'.

'and' is the link.

Can you help me to learn more?

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

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