Strange erect gait that could harm your health (9)
I believe the answer is:
cigarette
'could harm your health' is the definition.
I can't tell whether this definition defines the answer.
'strange erect gait' is the wordplay.
'strange' is an anagram indicator.
'erect'+'gait'='erectgait'
'erectgait' with letters rearranged gives 'CIGARETTE'.
'that' is the link.
Can you help me to learn more?
(Other definitions for cigarette that I've seen before include "Fag, coffin nail" , "Tobacco wrapped in paper" , "Cylinder of tobacco" , "tobacco in consumable form" , "harmful in nature" .)