Hairy creature heads for youthful expedition's tents, intimidatingly (4)
I believe the answer is:
yeti
'hairy creature' is the definition.
(I've seen this in another clue)
'heads for youthful expedition's tents intimidatingly' is the wordplay.
'heads for' indicates taking the first letters.
The first letters of 'youthful expeditions tents intimidatingly' is 'YETI'.
(Other definitions for yeti that I've seen before include "doubts in its existence" , "It probably doesn't exist" , "A legendary animal" , "Bigfoot" , "An abominable animal!" .)