Desire Sturgeon shows (4)
I believe the answer is:
urge
'desire' is the definition.
(I've seen this before)
'sturgeon shows' is the wordplay.
'shows' says the answer is hidden in the clue.
'URGE' can be found hidden inside 'sturgeon'.
(Other definitions for urge that I've seen before include "Impel, egg on" , "Encourage to proceed, drive onwards" , "Press to do something" , "Strongly encourage" , "Implore" .)