Little flower joiner found about mid-July (7)
I believe the answer is:
rivulet
'little flower' is the definition.
'rivulet' can be an answer for 'flower' (thesaurus). I'm not sure about the 'little' bit.
'joiner found about mid-july' is the wordplay.
'joiner' becomes 'rivet' (I can't justify this - if you can you should believe this answer much more).
'found about' is an insertion indicator.
'mid' means to look at the middle letters (mid- can mean the middle of something).
The middle letters of 'july' are 'ul'.
'rivet' going around 'ul' is 'RIVULET'.
Can you help me to learn more?
(Other definitions for rivulet that I've seen before include "Vile rut for small stream" , "burn" , "fast stream" , "Big stream" , "Brook" .)