Ten-foot midget (6)
I believe the answer is:
shrimp
'midget' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for shrimp that I've seen before include "tiny fellow!" , "Crustacean; small child" , "Diminutive person" , "very small one" , "Seafood" .)