Colourless sort of leap (4)
I believe the answer is:
pale
'colourless' is the definition.
(similar in meaning)
'sort of leap' is the wordplay.
'sort of' indicates anagramming the letters.
'leap' with letters rearranged gives 'PALE'.
(Other definitions for pale that I've seen before include "picket" , "Colourless" , "Feeble - wan" , "Lightly coloured" , "A bit of fencing" .)