America has poor fuel, but its serviceable (6)

I believe the answer is:

useful

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'serviceable' is the definition.
(similar in meaning)

'america has poor fuel' is the wordplay.
'america' becomes 'US' (United States).
'has' says to put letters next to each other.
'poor' indicates an anagram.
'fuel' with letters rearranged gives 'eful'.
'us'+'eful'='USEFUL'

'but its' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for useful that I've seen before include "Of service" , "profitable" , "Proficient; handy" , "Advantageous - efficacious" , "Make yourself . . . . . . - help out" .)

I've seen this clue in The Irish News.

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