Former president on vessel, showing outdoor ability (9)
I believe the answer is:
bushcraft
'outdoor ability' is the definition.
The definition suggests a singular noun which matches the answer.
'former president on vessel' is the wordplay.
'former president' becomes 'Bush' (either of the George Bushes).
'on' says to put letters next to each other.
'vessel' becomes 'craft' (synonyms).
'bush'+'craft'='BUSHCRAFT'
'showing' is the link.
Can you help me to learn more?
(Other definitions for bushcraft that I've seen before include "Backwoodsman uses this" , "survival skills" , "Skill at living in wild country" , "What's needed to travel in the wild" .)