Leap around light (4)
I believe the answer is:
pale
'light' is the definition.
('pale' can be similar in meaning to 'light')
'leap around' is the wordplay.
'around' indicates an anagram.
'leap' with letters rearranged gives 'PALE'.
(Other definitions for pale that I've seen before include "wooden post" , "Stake, lacking colour" , "livid" , "Very light coloured" , "Colourless" .)