Measure concentration of bird and tear off (7)
I believe the answer is:
titrate
'measure concentration' is the definition.
'titrate' can be an answer for 'measure' (titrating is a kind of measuring). I am unsure of the 'concentration' bit.
'bird and tear off' is the wordplay.
'bird' becomes 'tit' (tit is a kind of bird).
'and' says to put letters next to each other.
'off' indicates an anagram.
'tear' anagrammed gives 'rate'.
'tit'+'rate'='TITRATE'
'of' is the link.
Can you help me to learn more?
(Other definitions for titrate that I've seen before include "Experimental way to measure" , "measure volume" , "Determine strength of solution (chem.)" , "Carry out scientific analysis" , "Measure the strength of (a solution) using a reagent" .)