Doctor ambles; she is avoiding hospital gatherings (10)
I believe the answer is:
assemblies
'gatherings' is the definition.
(assembly is a kind of gathering)
'doctor ambles she is avoiding hospital' is the wordplay.
'doctor' is an anagram indicator.
'avoiding' indicates named letters should be taken away.
'hospital' becomes 'h'.
'ambles'+'she'+'is'='amblessheis'
'amblessheis' with 'h' taken out is 'amblesseis'.
'amblesseis' is an anagram of 'ASSEMBLIES'.
(Other definitions for assemblies that I've seen before include "Gatherings" , "More than one council" .)