Wishes friend to get hold of incredible hit song (4,4,5)

'hit song' is the definition.
(song recorded by various artists)

'wishes friend to get hold of incredible' is the wordplay.
'wishes' becomes 'longs' (to wish for something is to long for it).
'friend' becomes 'ally' (an ally is a friend or supporter).
'to get hold of' means one lot of letters goes inside another.
'incredible' becomes 'tall' (as in a tall tale).
'longs'+'ally'='longsally'
'longsally' placed around 'tall' is 'LONG TALL SALLY'.