Juxtaposed bottles let fluid out (3)
I believe the answer is:
tap
'let fluid out' is the definition.
'tap' can be an answer for 'let' (thesaurus). I'm unsure of the 'fluid out' bit.
'juxtaposed bottles' is the wordplay.
'bottles' indicates the answer is hidden within the clue (bottling is a kind of containing).
'TAP' can be found hidden inside 'juxtaposed'.
Can you help me to learn more?
(Other definitions for tap that I've seen before include "Get money from, strike" , "A form of dance" , "One can be hot or cold?" , "Flow controller; knock" , "Intercept; light knock" .)