Giant piece of anti-tank weaponry (5)

I believe the answer is:

titan

'giant' is the definition.
(titans are giant mythological creatures)

'piece of anti-tank weaponry' is the wordplay.
'piece of' indicates a hidden word.
'TITAN' is hidden within 'anti tank weaponry'.

(Other definitions for titan that I've seen before include "distant moon" , "Person of great importance" , "very big" , "Old Greek god or very strong person" , "Taint (anag.)" .)

I've seen this clue in the Evening Standard.

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