Scattered rainfall indicators? (7)
I believe the answer is:
showers
'scattered rainfall indicators?' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I can't see?
'rainfall indicators?' is the wordplay.
'rainfall' becomes 'shower' (shower is a kind of rainfall).
'indicators?' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'shower'+'s'='SHOWERS'
Can you help me to learn more?
(Other definitions for showers that I've seen before include "Rain spells" , "in April?" , "groups of slovenly people" , "Brief rainfalls" , "Washes over" .)