The most common and most likely answer to this crossword clue is the 6 letter word SEASON
I've seen this crossword clue in The Sunday Telegraph
S
E
A
S
O
N
More clues leading to the result SEASON
- Main issue in Spring, for example
- Boy going to ocean for the summer maybe
- Add enlivening quality to fall in US, say
- Flavour, one of four
- The main section’s working for run of performances
- Main offspring is mature salt
- Flavour is the main issue
- Those seven sailed, one short, one of four
- Time / to add salt and pepper?
- Air of sailor briefly showing temper
Buddy explains!

The straight part
We know that "E.g. fall for American" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case e.g. fall for american = season.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SEASON mean?
SEASON noun- Each of the four divisions of a year: spring, summer, autumn (fall) and winter
- A part of a year when something particular happens
- That which gives relish; seasoning.
- The period over which a series of Test matches are played.
- A group of episodes of a television or radio program broadcast in regular intervals with a long break between each group, usually with one year between the beginning of each.
- An extended, undefined period of time.
- The full set of downloadable content for a game, which can be purchased with a season pass.
- A fixed period of time in a massively multiplayer online game in which new content (themes, rules, modes, etc.) becomes available, sometimes replacing earlier content.
- To make fit for any use by time or habit; to habituate; to accustom; to inure.
- (by extension) To prepare by drying or hardening, or removal of natural juices.
- To become mature; to grow fit for use; to become adapted to a climate.
- To become dry and hard, by the escape of the natural juices, or by being penetrated with other substance.
- To mingle: to moderate, temper, or qualify by admixture.
- To copulate with; to impregnate.
- To flavour food with spices, herbs or salt.