Choose the music for the tango (3)
I believe the answer is:
opt
'choose' is the definition.
(thesaurus)
'the music for the tango' is the wordplay.
'the music' becomes 'op' (I am not sure about this - if you are sure you should believe this answer much more).
'for' says to put letters next to each other.
'the tango' becomes 't' (phonetic alphabet: alpha, bravo, charlie etc.).
'op'+'t'='OPT'
Can you help me to learn more?
(Other definitions for opt that I've seen before include "Make a choice" , "Pick from pot" , "Prefer, choose" , "Hold in the highest esteem" , "Decide between possibilities, choose" .)