Locum laid crib out for babyfood supplier (9,4)
I believe the answer is:
umbilical cord
'babyfood supplier' is the definition.
'locum laid crib out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'locum'+'laid'+'crib'='locumlaidcrib'
'locumlaidcrib' anagrammed gives 'UMBILICAL CORD'.
'for' acts as a link.
(Other definitions for umbilical cord that I've seen before include "Attachment to one's mother" , "Link between foetus and placenta" , "Mother-baby link" , "Attachment to a foetus" , "One's first lifeline?" .)