Crossword Genius

Chap about to hiss, as in self-assertive style (5)

Ross

I believe the answer is:

bossy

I'm a little stuck... Click here to teach me more about this clue!

'chap about to hiss as in self-assertive style' is the definition.
I can't tell whether this defines the answer.

'chap about to' is the wordplay.
'chap' becomes 'Bo'.
'about to' becomes 'ssy' (I can't explain this - if you can you should believe this answer much more).
'bo'+'ssy'='BOSSY'

Can you help me to learn more?

(Other definitions for bossy that I've seen before include "As overbearing type" , "authoritarian" , "Domineering (colloq.)" , "Autocratic" , "Disagreeably domineering" .)

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