Cry about getting some light (4)
I believe the answer is:
bulb
'some light' is the definition.
(bulb is a kind of light)
'cry about' is the wordplay.
'cry' becomes 'blub' (I've seen this before).
'about' says the letters should be written in reverse.
'blub' written backwards gives 'BULB'.
'getting' is the link.
(Other definitions for bulb that I've seen before include "Growing source" , "Source of flower or light" , "daffodil here" , "From which a tulip or light comes" , "Corm; electric light" .)