Strong belief one may be responsible for litter (5)

I believe the answer is:

dogma

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'strong belief' is the definition.
'dogma' can be an answer for 'belief' (synonyms). I am not certain of the 'strong' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dogma that I've seen before include "Settled opinion" , "Go mad (anag.)" , "Inflexible principle" , "Opinion viewed as truth?" , "church teaching" .)

I've seen this clue in The Independent.

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