Consuming marijuana, let loose and sing like a bird (7)
I believe the answer is:
tweedle
'sing like a bird' is the definition.
I can't judge whether this defines the answer.
'consuming marijuana let loose' is the wordplay.
'consuming' is an insertion indicator.
'marijuana' becomes 'weed' (synonyms).
'loose' indicates an anagram (letters are loosened from their original positions).
'let' with letters rearranged gives 'tle'.
'weed' inserted into 'tle' is 'TWEEDLE'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for tweedle that I've seen before include "... dum and ...dee, characters in Through the Looking Glass" , "Pipe" .)