Crane made of shell material (5)
I believe the answer is:
nacre
'shell material' is the definition.
(I've seen this in another clue)
'crane made' is the wordplay.
'made' indicates an anagram.
'crane' anagrammed gives 'NACRE'.
'of' is the link.
(Other definitions for nacre that I've seen before include "Mother-of-pearl from shellfish" , "Mother of pearl" , "Pearl's mum" , "Constituent of inlay furniture" , "inside of shell" .)