Baby feeder exciting wee runts (3,5)
I believe the answer is:
wet nurse
'baby feeder' is the definition.
(woman employed to breastfeed a child)
'exciting wee runts' is the wordplay.
'exciting' indicates an anagram.
'wee'+'runts'='weerunts'
'weerunts' anagrammed gives 'WET-NURSE'.
(Other definitions for wet nurse that I've seen before include "feeder" , "Coddle" , "Milk supplier" , "Woman to help mum" , "Woman feeding another's baby" .)