Limb concealed by most exotic creatures (7)

I believe the answer is:

marmots

'creatures' is the definition.
(marmot is a kind of creature)

'limb concealed by most exotic' is the wordplay.
'limb' becomes 'arm' (arm is a kind of limb).
'concealed by' means one lot of letters goes inside another.
'exotic' indicates anagramming the letters.
'most' is an anagram of 'mots'.
'arm' inserted within 'mots' is 'MARMOTS'.

(Another definition for marmots that I've seen is " rodents".)

I've seen this clue in The Telegraph.

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