Crossword Help Forum
Forum Rules

Second string provides momentum (5)

S+TEAM

Based on what I see in the dictionaries, not sure if this translates. In the US, the second string (or second team) are the substitutes off the bench when the first string (or team) takes a rest.

Passionate couple in the Seychelles (6)

S(TEAM)Y

Fuming, Mike leaves magnetism upset (8)

Very angry Magi sent off (8)

When at boiling point, 'ave a cuppa, me old China (8)

S tea Ming

Rhyming slang for me Old China - China plate (mate)
Old China - old Ming dynasty

#15

China should be lower case C here.

It used to make trains run on time in Kent before noon (5)

T (time) in SE (Kent) + AM (before noon)

After smoking joint, majesty's unusually blue (6)

(MAJESTY - J)*; not in my Chambers but I assume "smoked" = killed is a well-known slang term.

Each male entering place of debauchery gets sweaty (6)

[EA M] in STY

Gets hot text, gulps drink (6)

TEA in SMS