Alert leads to others bringing help (9)
I believe the answer is:
observant
'alert' is the definition.
(alert can mean observant or vigilant)
'leads to others bringing help' is the wordplay.
'leads to' indicates taking the first letters.
'help' becomes 'servant' (I've seen this before).
The first letters of 'others bringing' is 'ob'.
'ob'+'servant'='OBSERVANT'
(Other definitions for observant that I've seen before include "Alert" , "keeping close eye on things" , "Perceptive" , "Keen-eyed" , "Likely to notice" .)