Held top of church organ (5)
I believe the answer is:
clung
'held' is the definition.
(to cling to something is to hold it)
'top of church organ' is the wordplay.
'top of' says to take the initial letters.
'organ' becomes 'lung' (lung is a kind of organ).
The first letter of 'church' is 'c'.
'c'+'lung'='CLUNG'
(Other definitions for clung that I've seen before include "Held on tight" , "Held on tightly" , "Was emotionally close" , "Held on desperately" .)