Baby always wanting love starts to cry (4)
I believe the answer is:
bawl
'to cry' is the definition.
(I know that bawl is a more specific form of the action cry)
'baby always wanting love starts' is the wordplay.
'starts' indicates taking the first letters.
The initial letters of 'baby always wanting love' is 'BAWL'.
(Other definitions for bawl that I've seen before include "Howl" , "Loudly greet" , "Weep noisily" , "Shout; sounds like dance" , "Shout or cry noisily" .)