Lab process in which small bird takes part (9)
I believe the answer is:
titration
'lab process' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'small bird takes part' is the wordplay.
'small bird' becomes 'tit' (I've seen this before).
'takes' means one lot of letters go next to another.
'part' becomes 'ration' (ration is a kind of part).
'tit'+'ration'='TITRATION'
'in which' is the link.
Can you help me to learn more?
(Other definitions for titration that I've seen before include "lab procedure" , "Process used by chemist" .)