Bloomers dropped, pulled up to cover bare bum (6)
I believe the answer is:
tulips
'bloomers dropped' is the definition.
I can't judge whether this definition defines the answer.
'pulled up to cover bare bum' is the wordplay.
'pulled' indicates an anagram (letters pulled around).
'cover' suggests taking the first letters (in a down clue, the letter covering the word).
'bare bum' becomes 'lips' (I can't justify this - if you can you should believe this answer much more).
The first letters of 'up to' is 'ut'.
'ut' anagrammed gives 'tu'.
'tu'+'lips'='TULIPS'
Can you help me to learn more?
(Other definitions for tulips that I've seen before include "Popular flowers associated with Amsterdam" , "Slit up the Spring flowers" , "Garden flowers associated with Amsterdam" , "Garden flowers, musically from Amsterdam" , "Garden flowers - tip-toe through them in song" .)