Style of role calling for strong support (5)

I believe the answer is:

heavy

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'style of role' is the definition.
'heavy' can be an answer for 'role' (thesaurus). I am unsure of the 'style of' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for heavy that I've seen before include "Not light" , "Of great weight" , "serious!" , "Difficult to lift" , "Weighty - ponderous" .)

I've seen this clue in the Evening Standard.

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