Very sensitive atmosphere feeds high tension on boat (4-7)

'boat' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'very sensitive atmosphere feeds high tension on' is the wordplay.
'very sensitive' becomes 'rigger' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'atmosphere' becomes 'air' (synonyms).
'feeds' means one lot of letters goes inside another.
'high tension' becomes 'ht'.
'on' says to put letters next to each other.
'air' placed inside 'ht' is 'hairt'.
'rigger' put after 'hairt' is 'HAIR-TRIGGER'.

Can you help me to learn more?