A crane somehow hidden (6)
I believe the answer is:
arcane
'hidden' is the definition.
(I've seen this in another clue)
'a crane somehow' is the wordplay.
'somehow' indicates an anagram.
'crane' is an anagram of 'rcane'.
'a'+'rcane'='ARCANE'
(Other definitions for arcane that I've seen before include "Requiring special knowledge" , "Secret, hidden" , "Mysterious like a crane" , "Mysteriouss or secret" , "Abstruse, mysterious" .)