Also let loose to play the flute (6)
I believe the answer is:
tootle
'play the flute' is the definition.
(I've seen this in another clue)
'also let loose' is the wordplay.
'also' becomes 'too' (synonyms).
'loose' is an anagram indicator (letters are loosened from their original positions).
'let' with letters rearranged gives 'tle'.
'too'+'tle'='TOOTLE'
'to' is the link.
(Other definitions for tootle that I've seen before include "Casually play (a horn)" , "Proceed casually (in car)" , "Easily drive" , "Drive along" , "Wander about" .)