Composer William has no tips for singer (4)
I believe the answer is:
alto
'singer' is the definition.
(alto is a kind of singer)
'composer william has no tips' is the wordplay.
'composer william' becomes 'alt' (I am not sure about this - if you are sure you should believe this answer much more).
'has' says to put letters next to each other.
'tips' indicates one should take the final letters (I've seen 'tip' mean this).
The final letter of 'no' is 'o'.
'alt'+'o'='ALTO'
'for' is the link.
Can you help me to learn more?
(Other definitions for alto that I've seen before include "Singer's hidden inside chemical toilet" , "Second of four parts (in singing)" , "Key old > male who scores high" , "Woman's singing voice" , "The highest adult male singing voice" .)