Make it possible to roll about in mud, topless (5)

I believe the answer is:

allow

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'make' is the definition.
The definition and answer can be both related to thinking as well as being verbs in their base form.
Maybe you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for allow that I've seen before include "Permit or agree" , "praise no more" , "Sanction" , "Admit as acceptable" , "brook" .)

I've seen this clue in The Guardian.

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