Films regularly inspired by Shakespearean element (8)

I believe the answer is:

antimony

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'element' is the definition.
(antimony is a kind of element)

'films regularly inspired by shakespearean' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'inspired by' is an insertion indicator (some letters breathed in or 'inspired' by others).
'shakespearean' becomes 'antony' (I can't explain this - if you can you should believe this answer much more).
The alternate letters of 'films' are 'im'.
'im' put inside 'antony' is 'ANTIMONY'.

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(Other definitions for antimony that I've seen before include "My nation (anag) - metallic element" , "Brittle element" , "One element" , "Toxic metallic element used in semiconductors" , "Bluish-white element, symbol Sb" .)

I've seen this clue in The Guardian.

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