Eddy initially showing desire (5)
I believe the answer is:
surge
'eddy' is the definition.
(I've seen this before)
'initially showing desire' is the wordplay.
'initially' says to take the initial letters.
'desire' becomes 'urge' (I've seen this before).
The first letter of 'showing' is 's'.
's'+'urge'='SURGE'
(Other definitions for surge that I've seen before include "Movement in crowd" , "Sudden upward movement" , "crest of a wave" , "Outpouring" , "Rapid increase; powerful movement" .)