Leaflet written about baby food that's sticky and attracts insects (8)
I believe the answer is:
flypaper
'that's sticky and attracts insects' is the definition.
(flypaper is used to catch insects)
'leaflet written about baby food' is the wordplay.
'leaflet' becomes 'flyer' (I have seen 'Promotional leaflet' mean 'flyer' so perhaps 'leaflet' could also mean 'flyer').
'written about' means one lot of letters goes inside another.
'baby food' becomes 'pap'.
'flyer' enclosing 'pap' is 'FLYPAPER'.
(Other definitions for flypaper that I've seen before include "Sticky strip that catches small insects" , "for hanging being used for killing" , "Sticky trap for bluebottles etc" , "Sticky insect trap" , "Killer" .)