Tiny me aroused hostility? (6)
I believe the answer is:
enmity
'hostility?' is the definition.
(I know that enmity can be written as enmity)
'tiny me aroused' is the wordplay.
'aroused' indicates anagramming the letters (letters roused or stirred up into a new form).
'tiny'+'me'='tinyme'
'tinyme' with letters rearranged gives 'ENMITY'.
(Other definitions for enmity that I've seen before include "Antagonism, ill-will" , "Hostility, ill-will" , "Hostility between opposing groups or nations" , "Hate; aversion" , "discord" .)